+16. Expansion item ${listquote {<char} {<item>}}.
+
+17. An option for the ${readsocket {}{}{}} expansion to make the result data
+ cacheable.
+
+18. dkim_verify_min_keysizes, a list of minimum acceptable public-key sizes.
+
+19. bounce_message_file and warn_message_file are now expanded before use.
+
+20. $domain_data and $localpart_data are now set by all list-match successes.
+ Previously only list items that performed lookups did so.
+ Also, matching list items that are tail-match or RE-match now set the
+ numeric variables $0 (etc) in the same way os other RE matches.
+